package org.wkg.lesson04;

public class Demo_405 {

    public static void main(String[] args) throws InterruptedException {
        Counter405 counter = new Counter405();
        //locker没有其他线程访问，所有locker就是这个方法的唯一，从而可以锁定locker
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter.increase();
            }
        });

        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter.increase();
            }
        });

        t1.start();
        t2.start();
        t1.join();
        t2.join();

        System.out.println("count : " + counter.count);
    }


}

class Counter405 {
    public static int count = 0;
    Object locker = new Object();

    public void increase() {
        synchronized (locker) {
            count++;
        }

    }

}


